System and method for dynamic receive diversity allocation

• US 8,755,359 B2
• Filed: 11/16/2011
• Issued: 06/17/2014
• Est. Priority Date: 03/14/2008
• Status: Active Grant

• Current Assignee: Maxlinear Incorporated
• Original Assignee: Lantiq Deutschland GMBH (Intel Corporation)
• Inventors: Faber, Christian
• Primary Examiner(s): Chery, Dady
• Application Number:
  US13/297,909
• Publication Number:
  US 20120063434A1
• Time in Patent Office: 944 Days
• Field of Search: 370/216, 370/217, 370/219, 370/220, 370/334, 370/395.2, 370/395.21, 445/63.1, 445/562.1, 445/279.1
• US Class Current: 370/334
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0817 with multiple receivers and antenna path selection
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

A system and method for dynamic receive diversity allocation. A communications device comprises a first physical layer (PHY) unit, a second PHY unit, a first signal path coupled to a first antenna and to the first PHY unit, a switchable signal path coupled to a second antenna and switchably coupled to the first PHY unit and the second PHY unit, and a switch control unit coupled to the second antenna. The switch control unit dynamically generates a control signal used to switchably couple the second antenna to either the first PHY unit or the second PHY unit. The second antenna may be used to provided a needed transmit or receive antenna or an extra antenna for use in increasing diversity. Switching antennas reduces the total number of antennas and support hardware, such as digital processing hardware, for wireless communications standards having a high ratio of idle to busy time.

Claims

1. A communications device comprising:

a first physical layer (PHY) unit, the first PHY unit configured to transmit or receive data based on a first wireless communications specification;

a second PHY unit, the second PHY unit configured to transmit or receive data based on a second wireless communications specification;

a first signal path coupled to a first antenna and to the first PHY unit, the first signal path configured to perform processing on a signal in the first signal path;

a second signal path coupled to a second antenna and to the second PHY unit, the second signal path configured to perform processing on a signal in the second signal path; and

a switchable signal path coupled to a third antenna and switchably coupled to the first PHY unit and to the second PHY unit, the switchable signal path configured to perform processing on a signal in the switchable signal path and to switchably couple the third antenna to either the first PHY unit or the second PHY, wherein the first PHY, the second PHY, the first signal path, the second signal path, and the switchable signal path are disposed in the communications device.

2. The communications device of claim 1, wherein the first wireless communications specification and the second wireless communications specification comprise one wireless communications specification utilizing different frequency bands.

3. The communications device of claim 1, wherein the first signal path comprises a first analog hardware unit to perform analog signal processing on the signal in the first signal path.

4. The communications device of claim 3, wherein the first signal path further comprises a first digital hardware unit to perform digital signal processing on the signal in the first signal path.

5. The communications device of claim 1, wherein the switchable signal path comprises a multi-function analog hardware unit coupled to the third antenna, the multi-function analog hardware unit configured to perform analog signal processing on the signal in the switchable signal path according to either the first wireless communications specification or the second wireless communications specification.

6. The communications device of claim 5, wherein the switchable signal path further comprises a multi-function digital hardware unit coupled to the multi-function analog hardware unit, the multi-function digital hardware unit configured to perform digital signal processing on the signal in the switchable signal path according to either the first wireless communications specification or the second wireless communications specification.

7. The communications device of claim 1, wherein communications device is configurable to support the first wireless communications specification according to the following technique:

three independent spatial or time multiplexed data streams, or

two independent spatial or time multiplexed data streams with one antenna for diversity, or

one spatial or time multiplexed data stream with one antenna for diversity and one spatial or time multiplexed data stream, or

one spatial or time multiplexed data stream with two antennas for diversity, or

one spatial or time multiplexed data stream, or

two independent spatial or time multiplexed data streams,

and wherein the communications device is configurable to support the second wireless communications specification according to following techniques;

two independent spatial or time multiplexed data streams, or

one spatial or time multiplexed data stream with one antenna for diversity, or

one spatial or time multiplexed data stream.

8. The communications device of claim 1, wherein the communications device is configured to dynamically switch the switchable signal path based on detected parameters related to an operation mode of the communications device.

9. The communications device of claim 1, further comprising a switch control unit coupled to the third antenna, the switch control unit configured to generate a control signal for coupling of the third antenna to either the first PHY unit or the second PHY unit.

10. The communication device of claim 1, wherein the switchable signal path comprises a first switchable signal path and a second switchable signal path, the first switchable signal path coupled between the third antenna and the first PHY unit and the second switchable signal path coupled between the third antenna and the second PHY unit.

11. The communication device of claim 1, wherein the communication device comprises an access point.

12. An access point comprising:

a first physical layer (PHY) unit configured to transmit or receive data over a first wireless communications network;

a first antenna connected to the first PHY unit;

a second PHY unit different from the first PHY unit and configured to transmit or receive data over a second wireless communications network;

a second antenna connected to the second PHY unit; and

a switchable antenna connected either to the first PHY or the second PHY, the switchable antenna configured to transmit or receive data according to the first wireless communications network or the second wireless communications network,

wherein the access point is a single device configured to be operated in a network.

13. The access point of claim 12, wherein the first antenna comprises a plurality of first antennas.

14. The access point of claim 13, wherein the second antenna comprises a plurality of second antennas.

15. The access point of claim 12, wherein the switchable antenna comprises a plurality of switchable antennas.

16. The access point of claim 12, further comprising a processor coupled to the first PHY unit, and to the second PHY unit, the processor configured to process information to be transmitted or information received and to assign the switchable antenna to either the first PHY unit or the second PHY unit, the processor comprising a switch control unit coupled to the switchable antenna, the switch control unit configured to generate a control signal to specify the coupling of the switchable antenna to either the first PHY unit or the second PHY unit.

17. The access point of claim 12, further comprising a first signal path between the first antenna and the first PHY unit, and a second signal path between the second antenna and the second PHY unit, the first signal path configured to perform first analog and digital processing on a signal in the first signal path and the second signal path configured to perform second analog and digital processing on a signal in the first signal path.

18. The access point of claim 17, further comprising a switchable signal path between the first PHY and switchable antenna or the second PHY and the switchable antenna.

19. The access point of claim 18, wherein the switchable signal path includes a multi-function digital hardware unit and a multi-function RF unit.

20. The access point of claim 18, wherein the switchable signal path includes a multi-function digital hardware unit and separate RF units.

21. The access point of claim 18, wherein the switchable signal path includes separate digital hardware units and separate RF units.

22. An access point comprising:

a plurality of different physical layer (PHY) units, each PHY unit configured to be in a listen mode, a receive mode, or a transmit mode;

a plurality of antennas, each PHY unit connected to an antenna of the plurality of antennas;

a switchable antenna, the switchable antenna switchably connected to the plurality of PHY units; and

a processor unit configured to determine an operation mode of each PHY unit and configured to connect a selected PHY unit to the switchable antenna, wherein the selected PHY unit is selected in response to determining that,

the selected PHY unit is in the receive mode and the selected PHY unit requires the switchable antenna, or

the selected PHY unit is in the transmit mode and the selected PHY unit has been assigned the switchable antenna, or

another PHY unit is in the transmit mode and the selected PHY unit has not been assigned the switchable antenna, or

another PHY unit is in the receive mode and the other PHY unit does not require the switchable antenna, or

the selected PHY unit is in the listen mode,

wherein the access point is a single device configured to be operated in a network.

23. The access point of claim 22, wherein the processor unit is configured to select a default PHY unit prior to determine the operating mode.

24. The access point of claim 23, wherein the default PHY unit is selected based on a series of criteria, and wherein the series of criteria includes one or more of the following:

quality of service restrictions, traffic priority, traffic type, received signal strength, expected performance, data modulation-coding scheme, and performance history.

25. The access point of claim 22, wherein the processor unit is configured to repeat a selection and an application each time the selected PHY unit or the another PHY unit transmits or receives.

26. A communication network comprising:

a first communication device;

a second communication device; and

an access point being a single device in the communication network, the access point comprising;

a first physical layer (PHY) unit configured to transmit or receive data over a first wireless communication network;

a first antenna connected to the first PHY unit;

a second PHY unit configured to transmit or receive data over a second wireless communication network;

a second antenna connected to the second PHY unit; and

a switchable antenna connected either to the first PHY or the second PHY, the switchable antenna configured to transmit or receive data according to the first wireless communication network or the second wireless communication network.

27. The communication network of claim 26, wherein the first wireless communication network is configured to operate in a first multiple input multiple output (MIMO) mode and wherein the second wireless communication network is configured to operate in a second MIMO mode.